A214288 Primes of the form phi(n)+1 sorted by increasing n, where phi is the Euler totient function.

2, 2, 3, 3, 5, 3, 7, 5, 7, 5, 11, 5, 13, 7, 17, 7, 19, 13, 11, 23, 13, 19, 13, 29, 31, 17, 17, 13, 37, 19, 17, 41, 13, 43, 23, 47, 17, 43, 53, 19, 41, 37, 29, 59, 17, 61, 31, 37, 67, 71, 73, 37, 41, 37, 61, 79, 41, 83, 43, 41, 89, 73, 61, 47, 73, 97, 43, 61, 41, 101, 103, 53, 107, 37

Offset

1,1

Comments

Primes in A039649.

All primes are in the sequence.

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Mathematica

Select[Table[EulerPhi[n]+1, {n, 1, 1000}], PrimeQ]

Crossrefs

Cf. A000010, A039698 (associated n), A214287.

Sequence in context: A069974 A039650 A039649 * A332825 A253554 A252463

Adjacent sequences: A214285 A214286 A214287 * A214289 A214290 A214291

Keyword

nonn,easy

Author

Vincenzo Librandi, Jul 13 2012

Status

approved